Pocket stove



. Nov. 27,1923..

H. W. ALL-PORT POCKET STUVE Filed A ril-v, 1919 2 ShQ'et s-Sheet 1 Jgji i.

Nov. 27 1923.

H. W. ALI-PORT 4 POCKET STOVE Filed April '2 19,19

2 Sheets-Sheet 2 Hill N Patented Nov. 217, 1923.

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HENRY W. ALLPOPUT, OF CHICAGO, ILLINOIS.

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Application filed April 7, 1919. Serial No. 288,190. 7

'which a charge of material slowly combustible is adapted to give off a relatively mild heat for a prolonged period.

The invention will hereinafter be described as embodied for the purposes of illustration in a pocket or hand warmer, although it will be manifest that it may be used in a considerable number of other connections and in fact wherever a prolonged warmth or low heat is desired.

A principal object of this invention is the provision of a heater of this general character, the parts of which will be so constructed and arranged that the fuel may be provided in solid form and. slow combustion at the same time maintained with certainty.

A further and highly important object of the invention is the provision of a fuel material for heaters of this character which may be provided in such solid form and which will continue even combustion at an extremely slow rate.

Another highly important object of the invention is the provision of a heater of the character described, which will. not require a fuel that will soil the hands of the user and which may be readily charged and recharged by merely striking a solid stick as one would an ordinary match and positioning it thereafter. in place within the heater. r i

. Another object of the invention is the provision of a heater of this character, which will not permit overheating of the metal, which will readily adapt itself to the intended use, i. e., the pocket or the hand, and which will be of strong and sturdy construction and without delicate parts likely to require'repair'or replacement.

Other objects and advantages of the invention will be apparent as it is better un derstood from the following description when considered. in connection with the accompanying drawings which illustrate a present preferred embodiment of my invention; I

sure 13 and in the finished heater at the Referring to the drawings,

Figure 1 is a view of a pocket heater in which my present invention is incorporated for the purposes of illustration.

Fig. 2 is a similar view showing the eontainer without its outer fabric covering;

Fig. 3 is a transverse sectional View through the same;

Fig. 4 is a transverse sectional view similar to Fig. 3 through the container body or shell. I

Fig. 5 is a verticalsectional view through the heater showing a charge in place;

Fig. 6 is a perspective view of the fuel support; and

Fig. 7 a like view of a charge of fuel.

My invention contemplates the provision of a fuel in a stick, or other solid form, as counter distinguished from the loose material usually. used in devices of this character in the past and which when even used in cartridge form soils not only the hands of the person charging the heater but-also surrounding objects. To this end I have provided a heater particularly adapted to re-' ceive a stick charge and to maintain the combustion thereof after the charge is. ignited.

The form of the invention shown on the drawing, being particularly adapted for pocket use comprises an outer shell or com tainer of sheet metal 11, oval in cross section and having a plurality of perforations '12 at the two sides of greater curvature. It s closed at its bottom with any suitable clotop with a closure 14, having a nozzle 15 through which the charge may be inserted and adapted to rcc'eive'a cap '16. lVithin this body is secured a fuel support, shown in perspective in Fig. 6. This support is preferably square in cross section and consists of four sheetsof metal each bent longitudinally at 17 along a middle line the sheets being seamed together at their edges at 20 to provide inwardly, extending protuberances or ribs for a purpose to be presently described. This construction provides an elongated body, square in cross section, and at the sides of this body flanges l7" are bent inwardly to maintain therburning end of the charge elevated above the bottom of the shell or container when in upright position. This fuel support is positioned in the shell of the container before the top closure is secured in place and it preferably fits closely at its sides 18 to the adjacent sides of the shell and between the twov sets of perforations l2. 17 easily at the desired height the sides 18 are extended downwardly therebelow forming legs 19.

The entire shell is incased in an asbestos insulating sheet- 21, which is in turn covered by a fabric preferably of knitted material 22 having a soft surface against the asbestos and a hard surface outside. The cap is preferably also provided with this covering material. The charge in the present instance consists of a stick cylindrical in form and indicated generally at 31. One end is rounded, as indicated at 32,. and a channel or passageway 34: is provided from end to end. In the end of this passageway at the round end of the stick is provided an igniting material 35 carrying a striker cap 36, such igniting material and striker being of the general, character and n'zaterial of a wind match. The material ofthe stick or solid charge is preferably composed of a mixture of carbonaceous material as for example,

charcoal; binders and combustion retardants,

as for example, asbestos fiber and gum tragacanth, a rapid oxygen producing agent for oxidizing, as for example, potassium nitrate and a slower oxidizing agent, as, for example, manganese. dioxide. A deodorizing agent, as for example, powdered camphor may also be incorporated if desired. These materials are mixed in suitable proportions, anexcellent formula being- (a) Powdered or granulated hardwood charcoal 100 grams.

(7) Asbestos fiber 1 gram.

(0 Gum tragacanth 10 grams.

(d) Manganese dioxide C. P. 10 grams. age) Oam-phor. Mix thoroughly and a V Potassium nitrate 10 grams, dissolved in enough water (warm) to make 110 c. c.

This product is thoroughly mixed and finally results in a gummy, doughlike mass which is vigorousl kneaded and forced through a smooth bored tube of appropriate diameter and equipped with a mandrel. The resulting stick is somewhat plastic and is then thoroughly dried. A charge of this character is particularly adapted to be' burned in the container already described, which is designed to maintain an even and slow rate of combustion under all conditions. The structure being ignited, the stick is po sitioned, the ribs or protuberances 20 holding the stick away from the side walls of the fuel support and away also from the container. These ribs provide passageways about the fuel charge so that thefuel support acts as a flue. The maintenance of a proper kindling temperature with a restricted supply of oxygen and the regulation of the rate of combustion depends in large To dispose the flangemeasure upon the temperature of the air of combustion and the arrangement just described gives to the air of combustion the temperature by preheating in desired amount and as it comes. The preheating occurs also if the container be placed on its side or in other positions for the hot gases rising will draw in from the opposite side a certain amount of fresh air for combustion which will itself be preheated before entering into the flue even if entrance be had at both ends at the same time which might occur were the heater to lie on its side. It has been found that the heater acts well in any position it may be given. The oxodizing agents provide a portion of the oxygen and in connection with the retardants act to provide aninternal control for the rate of :combustion; the rapid oxidizing agent acting while the burning portion of the stick is in the more compressed form to carry on the combustion and the slower oxidizing agent acting to complete it as the material loses its compact form. The retardant not only retards the rate of combustion but also confines it to a desired zone, i. e. at the ignited end of the stick so that the combustion is slow and progressive.

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention defined in the claims or sacrificing any of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. A slow combustion heater and a fuel therefor, said heater comprising a fuel holder for a solid fuel and having air passages directing and controllingcombustion and a solid fuel including combustible matter and combustion controlling material co-operating with said holder to controlthe combustion of said combustible material.

2. A. slow combustion heater comprising a body having restricted passageways through its sides and adapted to containa slow burning material and means within the body for directing air of combustion and burnt gas throughout predetermined circuitous paths whereby to control the rate of con'ibustion.

3. A slow combustion heater comprising a body having restricted openings in its sides and adapted to contain the fuel being burned and means within the body for causing an indirect current of air to said fuel, thereby providing for preheating the air of gonibustion prior to its contact with the rue i 4.. A slow combustion heater comprising a body having perforate side walls; a fuel support therein for containing the fuel said fuel support being imperforate and confining the air of combustion and the burnt gas to a predetermined of the travel. p

5. A slow burning heater comprising. a body having perforate side walls and a fuel support imperforate throughout that part of its length adjacent the perforations in the side walls whereby to preheat incoming air.

6. A slow burning heater comprising a body and a fuel support for the fuel located within the body and means in said support for spacing the fuel from the body walls on all sides of said support.

7. In a slow combustion heater the combination of a body, a fuel support held in place by contact with the walls thereof, said body and support providing air and gas passageways both without and within said support.

8. A slow combustion heater comprising a body having restricted perforations through which air of combustion and burnt gas may pass and an elongated fuel support in said body, said fuel support being of elongated imperfo-rate form and having inwardly eX-' tending ribs for spacing a fuel charge from the walls of said body;

9. A slow combustion heater comprising a body, a fuel container therein of elongated form and means within the fuel container for centering the fuel in the container and away from the walls thereof and away form the walls of the body.

10. A slow burning heater comprising a container body, a fuel support in said con 'tainer body, a solid stick of fuel within said support and means for confining the air of combustion and the burnt gases to predetermined paths with respect to said stick.

11. A slow burning heater comprising an outer body or shell, a fuelsupport therein said support having ribs for maintaining a solid sick of fuel out of contact with'the body of the support.

12. A slow combustion heater and a fuel therefor, said heater comprising a fuel holder for solid fuel, and an outer body havpath throughout a part ing air inlets and providing airpassages for the air of combustion in contact with the fuel holder for preheating the air, and a solid fuel including combustible matter and combustion controlling material in propor tions for producing appropriate rate of combustion by the use of the air preheated in 7 said holder.

13. A slow combustion heater and a fuel therefor, said heater comprising a fuel holder for solid fuel, and an outer body having air inlets and providing air passages for the air of combustion in contact with the fuel holder for preheating the air, and a solid fuel including combustible matter and combustion accelerating and retarding materials in proportions for producing appropriate rate of combustion by the use of the air preheated in said holder.

14. A slow combustion heater and a fuel therefor, said heater comprising a fuel holder for a solid fuel stick, and a container having perforations for admitting air of combustion and providing circuitous passageways in contact with the holder for preheating said air of combustion, and a solid fuel stick within said holder and providing combustion passages between said stick and said holder.

15. A slow combustion heater and a fuel therefor, said heater comprising a fuel holder for a solid fuel stick, and a container having perforations for admitting air of combustion and providing circuitous passageways in contact with the holder for preheating said air of combustion, and a solid fuel stick within said holder and providin a combustion passageway through said stick.

16. A slow combustion heater and a fuel therefor, said heater comprising a fuel holder for a solid fuel stick, anda container having perforations for admitting air of combustion and providing circuitous passageways in contact with the holder for preheating said air of combustion, and a solid fuel stick Within said holder and providing 7 HENRY W. ALLPORT. 

